Arrangement for eliminating distortions of weft threads in fabric

ABSTRACT

An arrangement to eliminate distortions of weft threads in fabric, comprising a roller passed about by the fabric and freely rotating on an axle, which roller and axle consist in their length of at least two parts connected to each other by a hinge, and rest therethrough on a support, while the free outer ends of these parts are hinged in appropriate supports, that are made mutually displaceable in case of distortions, so as to swing the roller and thus change the length of the distance travelled by different sections of one and the same distorted weft thread, thereby eliminating the distortions.

United States Patent 1191 Illarionov et al.

ARRANGEMENT FOR ELIMINATING DISTORTIONS OF WEFT THREADS IN FABRICInventors: Velizary Semenovich lllarionov; Vadim Alexeevich Kostin, bothof lvanovo, U.S.S.R.

Ivanovsky Nauchno-Issledovatelsky Experimentalno KonstruktorskyMashinostroitelny Institut, lvanovo, U.S.S.R.

Filed: June 11, 1970 Appl. No.: 45,352

Assignee:

u.s. c1. ..26/51.3, 26/51.5, 26/63, 226/21 rm. c1. ,.D06h 3/12 Field ofSearch ..26/51.3, 51.4, 51.5, 63, 65, 26/66, 67; 226/21, 22, 23

References Cited UNITED STATES PATENTS 920,122 5/1909 Farnworth ..26/63X 2,024,618 12/1935 Whiting ..26/63 X 1,645,036 Ill/I927 Bacon ..26/63Primary ExaminerRobert R. Mackey Attorney-Waters, Roditi, Schwartz &Nissen [57] ABSTRACT An arrangement to eliminate distortions of weftthreads in fabric, comprising a roller passed about by the fabric andfreely rotating on an axle, which roller and axle consist in theirlength of at least two parts connected to each other by a hinge, andrest therethrough on a support, while the free outer ends of these partsare hinged in appropriate supports, that are made mutually displaceablein case of distortions, so as to swing the roller and thus change thelength of the distance travelled by different sections of one and thesame distorted weft thread, thereby eliminating the distortions.

2 Claims, 2 Drawing Figures ARRANGEMENT FOR ELIMINATING DISTORTIONS FWEFT THREADS IN FABRIC The present invention relates to apparatus foreliminating weft thread distortions, and more particularly to apparatusfor the elimination of weft thread distortions that are employed infabric dressing equipment, for example, in sizing machines before thedrying drums, or in the dressing and finishing sections before thestretching machines, etc.

One of the requirements of fabric is the perpendicularity of the weftthreads with respect to the warp.

In the process of fabric manufacture and dressing the perpendicularityis often disturbed, i.e., the weft threads become distorted with respectto the warp threads.

The types of distortions are quite diverse, however, in the overwhelmingmajority of cases all the distortions can be reduced to three principaltypes: diagonal distortion (the weft thread follows a straight line,though not perpendicular to the warp), arc distortion (the weft threadfollows an arc), and combined distortion, i.e., a combination of the twosaid distortions.

Known in the art are arrangements for eliminating weft threaddistortions, comprising one or several rotating cylindrical rollerspassed about by the fabric, these rollers being mounted on axles whoseends are hinged to supports that are mutually displaced in case of weftthread distortion, so as to swivel the rollers and thus change thelength of the distance travelled by different sections of one and thesame distorted weft thread (see, for example, West German Pat. No.1020299, cl. 8b/l4, dated 1958).

These arrangements permit diagonal distortions.

To obviate arc and combined distortions of weft thread this arrangementneeds additional rollers with an are surface to be installed.

However, additional rollers complicate the design of the arrangement,and involve added tension in the fabric, which stretches it.

An object of the invention is to devise an arrangement for eliminatingweft thread distortions with such a design of the roller, in whichcompensation can be obtained for diagonal, arc, and combineddistortions.

With this object in view, in an arrangement comprising a rotating rollerpassed about by the fabric, which roller is mounted on an axle whoseends are hinged to supports that are mutually displaced in case of weftthread distortion, so 'as to swing the roller and thus change the lengthof the distance travelled by different sections of one and the samedistorted weft thread, the roller and the axle in their length,according to the invention, consist of at least two separate parts, saidparts of the axle being hinge-jointed to each other, and this jointrests on an additional support located between the main supports.

The additional support in the arrangement is preferably offset relativeto the main supports in the direction of the fabric section moving offthe roller. This helps to prevent fabric slipping to the additionalsupport, and reduces creasing thereof while thread distortions are beingeliminated.

For a better explanation of the invention, the following is adescription of a particular exemplary embodiment thereof with referenceto following the appended drawing, wherein:

eliminating only FIG. 1 is a front view which shows the arrangementaccording to the invention and,

FIG. 2 is a section taken on line II II of FIG. I.

The arrangement to eliminate weft thread distortions in fabric comprisesrotating rolls 1 and 2 (FIG. 1) conveying fabric 3, and roller 4 locatedbetween rolls 1 and 2, and freely turning on axle 5.

Roller 4 in its length consists of two separate rotary parts 6 and 7.Axle 5 also consists in length of two separate parts 8 and 9.

The inner ends of parts 8 and 9 are connected to each other through ahinge 10 resting on a retaining means in the form of an additionalsupport 11.

The free outer ends of parts 8 and 9 are connected to supports 12 and13, respectively.

Each of supports 12 and 13 consists of a nut 14 (FIG. 2), wherein thefree inner end of each of parts 8 and 9 of axle 5 is hinged.

Each nut 14 is fitted on a guide screw 15, which is rotated by anelectric motor 16 through a reduction gear 17.

In case of weft thread distortion, nuts 14 move along guide screws 15,thereby swinging parts 6 and 7 of roller 4 about hinge 10 in order tochange the length covered by different sections of one and the samedistorted weft thread.

To prevent slipping of fabric 3 toward support 11, and'to reducecreasing of this fabric while eliminating weft thread distortions,support 11 is offset relative to nuts 14 by a distance I in thedirection of section 18 of fabric 3 that runs off roller 4.

The value of l is determined on the one hand by the absence of slippingof fabric 3 towards hinge 10 and minimum creasing in eliminatingdistortions, and on the other hand by minimum displacement of fabric 3along roller 4, and maximum value of the distortion to be eliminated.

In case of no weft thread distortion, parts 6 and 7 of roller 4 are inthe middle position, the different sections of one and the same weftthread of fabric 3 travelling equal distances between rolls 1 and 2.

In the case of, e.g., diagonal distortion (line A in FIG. 1), which ischecked visually or by sensing elements (not shown in the drawing),motors 16 are switched on to rotate guide screws 15 through reductiongears 17, so, that nut 14, part 9 of axle 5 together with the rotarypart 7 of roller 4, moves rightward (see arrow B in FIG. 2) to adistance determined by the value of the distortion being eliminated. Theother nut 14, part 8 of axle 5 with the rotary part 6 of roller 4, movesan equal distance in reverse direction.

Movement of nuts 14 causes swinging of the respective parts 6 and 7 ofroller 4 about hinge 10 to an angle determined by the value of the weftthread distortion being eliminated.

With such a disposition of the parts of roller 4, the advanced sectionsof the distorted weft threads of the right half (as in FIG. 1) of fabric3 will travel a longer distance between rolls 1 and 2, as compared tothe middle section of fabric 3. The sections of the left half of thefabric will correspondingly cover a shorter distance, as compared to themiddle section. As a result, the (diagonal) distortions of the fabricweft threads are eliminated.

If the diagonal distortion has a reverse direction, nuts 14 move in theopposite direction, thus swinging parts 6 and 7 of roller 4 about hinge10 to the other side.

In case of an arc distortion of the weft threads, which is convex in thedirection of movement of fabric 3 (fabric movement is conventionallyshown by arrow C), nuts 14 are simultaneously moved in one directionopposite to that shown by arrow B (FIG. 2).

In this case parts 6 and 7 of roller 4 swing about hinge so, thatbetween parts 8 and 9 of axle 5, an internal angle of less than 180 isformed. This results in the weft thread sections located nearer to theedges of fabric 3 travelling shorter distances between rolls 1 and 2, ascompared to the middle section of the fabric. As a consequence, the arcdistortion is eliminated. If the arc distortion is convex opposite themovement of fabric 3, nuts 14 move simultaneously in one directionconventionally shown by arrow B (FIG. 2). In this case each part 6 and 7of roller 4 swings about hinge 10 to an angle a determined by the valueof arc distortion so, that the weft thread sections located nearer tothe edges of fabric 3 cover longer distances between rolls 1 and 2, ascompared to the fabric middle section. Thus, said are distortion iseliminated.

In the case of combined distortion, parts 6 and 7 of roller 4 are set inpositions intermediate with respect to those described above, andcorresponding to the values of the arc and diagonal distortions makingup the combined distortion.

The described arrangement allows partial or complete elimination of adistortion of tight selvage type, i.e., a distortion when weft thread iscurved only near the edge of the fabric.

This is also remedied by locating both or one of parts 6 and 7 of roller4 in accordance with the value of distortion.

Usually the process of compensating weft thread v distortions isaccompanied by fabric creasing, which may cause defects in the form ofso called wrinkles. In the proposed arrangement roller 4 performs aspreading action on the fabric because of the displacement of hinge 10with respect to nuts 14 to a distance I in the direction of section 18of fabric 3 that runs off roller 4.

Thus, the possibility of fabric creasing is significantly reduced orcompletely excluded.

What we claim is:

1. Apparatus for eliminating weft thread distortions in fabric, saidapparatus comprising: two spaced rotating rolls for conveying thefabric: an axle mounted between said rolls and having a freely rotatingroller thereon, about which the fabric is passed, said roller and axlerespectively including two separate sections, a hinge joining saidsections at opposite free inner ends thereof to permit relative pivotalmovement therebetween; a retaining means supporting said hinge; adisplaceable support pivotably supporting the outer free end of the axleof each section, means for translationally moving said supportsindependently of one another to translationally move the outer ends ofthe axles of the respective sections and thereby cause independentpivotal movement of the sections about said hinge to compensate forthread distortion; said supports being individually displaceable toswing the sections of said roller about said hinge to change the lengthof the distance travelled by different sections of one and the samedistorted weft thread.

2. Apparatus as claimed in claim 1 wherein the retaining means is offsetrelative to the supports in the direction of the fabric section thatruns off the roller.

1. Apparatus for eliminating weft thread distortions in fabric, saidapparatus comprising: two spaced rotating rolls for conveying thefabric: an axle mounted between said rolls and having a freely rotatingroller thereon, about which the fabric is passed, said roller and axlerespectively including two separate sections, a hinge joining saidsections at opposite free inner ends thereof to permit relative pivotalmovement therebetween; a retaining means supporting said hinge; adisplaceable support pivotably supporting the outer free end of the axleof each section, means for translationally moving said supportsindependently of one another to translationally move the outer ends ofthe axles of the respective sections and thereby cause independentpivotal movement of the sections about said hinge to compensate forthread distortion; said supports being individually displaceable toswing the sections of said roller about said hinge to change the lengthof the distance travelled by different sections of one and the samedistorted weft thread.
 1. Apparatus for eliminating weft threaddistortions in fabric, said apparatus comprising: two spaced rotatingrolls for conveying the fabric: an axle mounted between said rolls andhaving a freely rotating roller thereon, about which the fabric ispassed, said roller and axle respectively including two separatesections, a hinge joining said sections at opposite free inner endsthereof to permit relative pivotal movement therebetween; a retainingmeans supporting said hinge; a displaceable support pivotably supportingthe outer free end of the axle of each section, means fortranslationally moving said supports independently of one another totranslationally move the outer ends of the axles of the respectivesections and thereby cause independent pivotal movement of the sectionsabout said hinge to compensate for thread distortion; said supportsbeing individually displaceable to swing the sections of said rollerabout said hinge to change the length of the distance travelled bydifferent sections of one and the same distorted weft thread.